Simmature Technologies Pvt. Ltd.
Backend Developer · Mar 2025 to Jun 2025 · Remote, India · full time
Profiles, feeds, connections, and messaging for a professional networking platform. Messaging was the part with a real constraint: a thousand people talking at once across more than one process means a socket on one instance has to reach a socket on another. Redis Pub/Sub between them was the simplest thing that worked, and simple mattered because encryption and voice calling sat on the same path.
Visit Simmature Technologies Pvt. Ltd.What I owned
- Built the backend covering profiles, feeds, connections, and interactions on Node, MongoDB, and Redis.
- Messaging on Socket.IO with Redis Pub/Sub between instances, holding 1,000+ concurrent with end-to-end encryption and voice calling on the same path.
- JWT with Google and LinkedIn sign-in and 2FA on top, and exponential backoff on Twilio and SendGrid to 99% delivery, because a verification code that arrives late is worse than useless.
Node.jsMongoDBRedisSocket.IOJWTOAuth 2.0TwilioSendGridAWS S3